I read up on these and was impressed. So I will be finding out soon if they are b.s. or not. Also I picked up 7 quarts of Pennzoil Platinum 5w-20 oil full synthetic and a K&N HP-2010 synthetic filter i have been impressed with the Ram service dept s regular oil. i have been a die hard Mobil 1 synthetic for years.. anyways I,ll update this for anyone interested . i should se a small increase in mpgs

Are your cold temperatures in South Carolina that low that you need 5w (-30 degrees) on the left figure?

True enough synthetic is versatile in temperature viscosity, but 5w?
The K&N filter is a top choice filter for sure. Keeps the oil clean a long time.